Abstract: A dynamometer system includes a prime mover dynamometer and a gearbox. The prime mover dynamometer includes a primary output configured to be coupled to a drivetrain that represents a portion of a vehicle powertrain, a secondary output having a fixed speed relationship with the primary output, and a controller. The gearbox is coupled to the secondary output and configured to be coupled to an electric motor. The controller alters a speed and torque of the outputs based on a calculated speed and torque associated with a simulated internal combustion engine that represents another portion of the vehicle powertrain to impart speed oscillations into the electric motor and to impart torque oscillations into the drivetrain.

Abstract: A dynamometer system includes a prime mover dynamometer and a gearbox. The prime mover dynamometer includes a primary output configured to be coupled to a drivetrain that represents a portion of a vehicle powertrain, a secondary output having a fixed speed relationship with the primary output, and a controller. The gearbox is coupled to the secondary output and configured to be coupled to an electric motor. The controller alters a speed and torque of the outputs based on a calculated speed and torque associated with a simulated internal combustion engine that represents another portion of the vehicle powertrain to impart speed oscillations into the electric motor and to impart torque oscillations into the drivetrain.

Abstract: A control system includes a controller. The controller repeatedly excites a control loop characterized by parameters having randomly selected values for each excitation and scores a response of the control loop to each excitation relative to a target signal until the scores no longer achieve a value less than a minimum of the scores for a predefined number of excitations occurring after the excitation yielding the minimum of the scores to auto-tune the control system.

Abstract: A control system includes a controller. The controller repeatedly excites a control loop characterized by parameters having randomly selected values for each excitation and scores a response of the control loop to each excitation relative to a target signal until the scores no longer achieve a value less than a minimum of the scores for a predefined number of excitations occurring after the excitation yielding the minimum of the scores to auto-tune the control system.

Abstract: A dynamometer may be configured to simulate the rotating inertial characteristics of a wheel-tire assembly slipping relative to a road surface and having rotating inertial characteristics different than the rotating inertial characteristics of the wheel-tire assembly being simulated.

Abstract: A test stand may include a clutch operatively arranged with a dynamometer and a flywheel. The test stand may further include a controller configured to control the clutch to decouple a rotating inertia of the dynamometer from a rotating inertia of the flywheel such that the rotating inertia of the flywheel exhibits a desired rotating inertia.

Abstract: A test stand may include a clutch operatively arranged with a dynamometer and a flywheel. The test stand may further include a controller configured to control the clutch to decouple a rotating inertia of the dynamometer from a rotating inertia of the flywheel such that the rotating inertia of the flywheel exhibits a desired rotating inertia.

Abstract: A dynamometer may be configured to simulate the rotating inertial characteristics of a wheel-tire assembly slipping relative to a road surface and having rotating inertial characteristics different than the rotating inertial characteristics of the wheel-tire assembly being simulated.

Abstract: A rotational testing system for a test article includes a rotational test stand. The rotational test stand includes a rotating element having a drive end capable of being mechanically coupled with the test article. The rotational testing system also includes a non-isolating torsional damper attached to the rotating element.

Abstract: A rotational testing system for a test article includes a rotational test stand. The rotational test stand includes a rotating element having a drive end capable of being mechanically coupled with the test article. The rotational testing system also includes a non-isolating torsional damper attached to the rotating element.